Bino mounting question

[neilm]

I have some big bins (strathspey 20x90) that sit nice and comfortably on my tripod, attached by the central stabilising bar that's between the two lenses. This keeps them nice and firmly in place so they can’t fall off or tip up/down. However there appears to be nothing to stop them yawing, central bar stays still bit the lenses can move like a rolling boat.

Are there any adjustments that I can make to tighten this up or is it a case of all big binoculars do this because …..

Thanks

Neil